Strain Regulation and Defect Passivation of FA-Based Perovskite Materials for Highly Efficient Solar Cells.

ABSTRACT: Formamidine lead triiodide (FAPbI₃ ) perovskites have attracted increasing interest for photovoltaics attributed to the optimal bandgap, high thermal stability, and the record power conversion efficiency (PCE). However, the materials still face several key challenges, such as phase transition, lattice defects, and ion migration. Therefore, external ions (e.g., cesium ions (Cs⁺ )) are usually introduced to promote the crystallization and enhance the phase stability. Nevertheless, the doping of Cs⁺ into the A-site easily leads to lattice compressive strain and the formation of pinholes. Herein, trioctylphosphine oxide (TOPO) is introduced into the precursor to provide tensile strain outside the perovskite lattice through intermolecular forces. The special str

SUBMITTER: Zhang L 

PROVIDER: S-EPMC10870053 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature